>> mitt romney does have tax cuts in his plan. the issue is it really a $5 trillion tax cut because what he says it will make more revenue because it creates more jobs. those people then start paying taxes. so it doesn't actually cut revenues to the government. but there are cuts in the tax rate that individuals pay. i'm not sure how to count whether that is or is not a tax cut. >> reporter: bottom line, $5 trillion not $5 trillion or there is no bottom line? >> the romney-ryan plan has never specified exactly what the loopholes they will close or how the math adds up, but they say it is not a $5 trillion tax cut because it has these other residual benefits. >> well, that cleared that up, didn't it? both candidates are working hard, though, to win the support of young voters. >> last night students at the university of maryland in college park watched the debate and then offered their opinions of the candidates in a high- tech way. matt jablow has more. >> reporter: for professor philip resnick, the first general election debate o